Search by number: 1971 Ford Motorhome 6.4L 8 Cyl Alternator ProAmp 7058 $84.00 each OPTIONS: Standard 40 Amp ProAmpN 7058N $95.00 each OPTIONS: Standard 40 Amp Why is there more than one unit for my car? Look at the TECH SPECS when more than one unit is shown for your car. AMPS (ELECTRIC CAPACITY): must match you vehicle electric requirements. *** Call us if you are looking to increase your unit capacity! OE ALTERNATOR MANUFACTURER: It is recommended to match the Make of your alternator